TRNW-2: ZF8HP45 (850RE & 845RE) P0733

[Chris and Cathy Kershaw]

I just watched this transtec video using their tool. Looks to me like it
could be done without the tool, maybe get an old piston to make a jig for
drilling the rivets. We haven't seen but a few with gear ratio or other
internal problems. The vb/tcms have been on intergalactic backorder
everytime I check. Used units seem to cheap & plentiful.
https://youtu.be/_npBS3W3dgI

On Wed, Feb 19, 2025 at 11:47 AM tucker tuckertrans.com via trnw2 <
trnw2 at trnw.net> wrote:

> Group,
> Does anyone know what the common cause of P0733 (gear ratio error in 3rd)
> on the ZF845 is?  Many times it is intermittent and works perfect on a test
> short drive but the P0733 comes back quite often.  We have put in about 5-6
> used and rebuilt transmission, but have not rebuilt any for this common
> concern.  We did buy a NEW 850RE valvebody and put on one that had 60,000
> miles and it did NOT correct the problem.   It also seems like the
> 2016-2017 are the most common years to see the code.  As for driving it
> here is what's weird, is the transmission has a bad shift from 3rd to 4th cold.
> It flares.  Reman units from Chrysler are around 2,900, so they are almost
> not worth rebuilding, however now they are on backorder.  I find it odd too
> that Jasper, Certified, and ETE have them listed as not available.  So what
> are you guys doing, and what is the cause of the P0733.
>
> Dan Tucker
>
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